/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundDataReference.h
This value can be used to determine which methods are supported for accessing a data reference using GetDataReadReference<>() or GetDataWriteReference<>()
namespace Metasound { enum EDataReferenceAccessType { None = 0x00, Read = 0x01, Write = 0x02, Value = 0x04, } }